[QUOTE="Dentist"] [QUOTE="Simon Wilson"] Have I missed anything?[/QUOTE] If this is a rough stone wall, i.e. no bonding, it will still collapse, you might just delay things slightly. The only long term repair is rebuild from foundation upwards - nasty big job. If it's dressed stone with a bond, like brickwork, your plan may work[1][2].[/QUOTE] Rough stone can be repaired but its a job for the experts and not cheap , usally only done if the walls part of a listed structure [QUOTE] [1] buttresses can be comparatively thin, but must spread load to a pad with a vertical component, in order to resist horizontal loading[2]. [2]Theoretically.[/QUOTE]